Lubricant compressor



Feb. 8, 1949.

J. T. LEONARD LUBRI CANT COMPRES SORv Filed Dec;t 1, 1944 Patented Feb. 8, 1.949

UNITED STAT-its PATENT orifice Applicationllecember 1, 19.44, Serial 575765159' `1 claim.V (c1. 1oz-133i My invention relates compressors, and .morepartcularly to handzoperated .double acting. lubricant compressors 'for use in centralized .lubricating systems, aswell as for .general use. v Y' It is an. object of my invention to providea hand operated lubricantcompressor having two pumping cylinders and plungers'alternately operable by means of a single' handle, whereby by swinging the operating handle-back andforth, lubricant is discharged from the compressor o both the forward and return strokes. i

A further object is to provide an improved lubricant compressor which is easily operable, is simple in construction, and which may be economically manufactured.

Other objects will appear from the following description, reference being had to the accompanying drawings, in which:

Fig. 1 is a central longitudinal sectional view of the improved hand operated compressor; and

Figs. 2 and' 3 are transverse sectional views thereof, taken on the lines 2-2 and 3 3, respectively, of Fig. 1.

In Figs. l, 2 and 3, the invention is shown as incorporated in a hand operated portable lubricant compressor or grease gun, comprising a head casting 88 one end of which is suitably threaded to receive a reservoir barrel 82. This barrel contains a conventional spring pressed follower piston 84 which may be retracted by means of a handle 8S attached to a rod 88 passing through the follower piston 84.

The head 8!) of the grease gun is provided with two simil-ar cylinders 9|) in which plungers 92 are reciprocable. Spring pressed outlet check valves 94, held in place by threaded hollow sleeves 96, normally close the ends of outlet ports 98. The lubricant flowing past the check valves 94 is discharged through the sleeves 96 into a space |00, into which a suitable bushing |32 is threaded, this bushing being threaded for the recep-tion of a nozzle, or of the usual flexible hose, at the end of which there is the usual coupling for attachment to the lubricant receiving fittings.

Each of the plungers 92 is provided with a T- shaped passageway |04, the end of kthis passageway which opens into the cylinder 99 being enlarged to form a chamber for a check valve |116 which is retained in the chamber by a transverse pin |88. The plungers 92 are guided in bores formed in lugs HD, which are integral with the head 8U. The outer ends of the plungers 92 have recesses or notches 2 formedtherein for the generally to lubricant Y reception ofY the :roumled.lendsl of an-.-operating lever H4.

The lever ||4 has a squared opening' in yits .center f for `the .reception of the. .squared portion .|.|6.of an operatingV shaft l| |8.` y.Ilhisshaft has .a cylindrical. er1-d portion `z|2t| which projects into a suitablev .bearing opening formed in a: vlugV 122: of the castingll; and-also has'a bearing in a bore formed in kalug |24-, likewise formed. integralls7 with-the head: casting 80. Leakage'of .lubricant .around the-larga diameter portion. o.' shaft; .l i8 is prevented by packing |26 held in place by a packing gland |28. The outer end of the shaft i8 has a squared portion |30 which is tted into a complementally shaped opening in the arm |32 of a yoke |34. The other arm |36 of the yoke |34 is pivoted on a shouldered stud |38 which is .threaded in the boss |22. A pair of washers |40 are interposed between the shoulder of the stud |38 and the body casting 80. The yoke |34 may be in the for-rn of a casting or forging and have a handle |42 terminating in the ball grip |44, formed integrally therewith.

The provision of the washers |40 makes it possible, upon removal of the stud |38 and these washers, to slide the yoke sidewardly and disengage the yoke arm |32 from the squared end |30 of the operating shaft 8, thereby permitting disassembly of the handle and yoke from the head 83. The stroke of the operating handle |42 is limited by stop lugs |46 and |41 formed on the casting 80. The reservoir of the compressor may conveniently be filled through a check valved lubricant receiving fitting |48 of any suitable construction, this fitting being threaded in the head casting in the position best shown in Figs. 1 and 2. Due to its location, the lubricant supplied to the grease gun will tend to purge the interior of the head casting 80 of air which may have collected therein, forcing this air into the reservoir barrel 82.

In using the grease gun, it is lled by attachment of a suitable coupler to the tting |48, the coupler being connected to a suitable source of lubricant under pressure; As the lubricant is forced into the grease gun, the follower piston is forced to the right (Fig. 1) against the force of its spring until the latter is compressed. The gun is then in condition for use, and assuming that it is provided with a suitable coupler and nozzle attached to the bushing |32, it may be used in the customary -manner by reciprocating the handle |42 through an angle determined by the limit stops |46 and |41. It will'be'noted that lubricant is discharged upon both theforembodiment of my invention, it will ebe apparent that numerous variations and modifications f thereof may be made without departing from the underlying principles of the invention. I

therefore desire, by the followingl claim, to in-` clude within the scope of my invention all such variations and modicatlons by which substantially the results of my invention may be obtained through the use of substantially the same or equivalent means.

I claim: j l Aportable lubricant compressor comprising, a

body' having a passageway for the reception of lubri-cant'and having two cylinders therein communicating with the passageway, an outlet check valve for each of the cylinders, plungers reciprocable in said cylinders, each plunger having a 'sidewardlyopen notch therein, and means for reciprocating the plungers to discharge lubricant F1 nu from the cylinders past the check valves, said means comprising a shaft mounted for oscillation in the body, said shaft having a non-circular end portion projecting from the body, a handle having a generally semicircular yoke, one arm of the yoke having a complementally shaped opening receiving the non-circular portion of the shaft, a shouldered stud threaded in the body in axial alignment with the shaft and forming a :bearing for the other arm-of the yoke, and an roperating lever nonrotatably secured to the shaft and having rounded ends respectively bearing in the notches in the plungers.

' JOHN T. LEONARD.

REFERENCES CITED The following references are of record in the le oflthis patent:

UNITED STATES PATENTS Number Name Date 1,538,911 Taylor May 26, 1925 1,739,438 Butler Dec. 10, 1929 "72,037,434 Pfauser Apr. 14, 1936 2,187,036 Kerber Jan. 16, 1940 2,384,824 Eitner Sept. 18, 1945 FOREIGN PATENTS Number Country Date 812,675 France 1937 

